LCD Display HD44780 4x20 chr 20x4 Yellow neg Backlight

LCD Pin Number

Symbol

Function

Parallel/Power Connection

1

Vss

Display power ground

Molex ground (either black wire)

2

Vdd

Display power +5V

Molex +5v (red wire)

3

Vo

Contrast Adjust. Altered by adjusting the voltage to this pin, grounding it sets it to maximum contrast.

Molex ground (either black wire)

4

RS

Register select

Parallel pin 16

5

R/W

Data read/write selector. Its possible to read information from a display however there's no need for it here so grounding it sets it permanently write.

Molex ground (either black wire)

6

E

Enable strobe

Parallel pin 1

7

DB0

Data Bus 0

Parallel pin 2

8

DB1

Data Bus 1

Parallel pin 3

9

DB2

Data Bus 2

Parallel pin 4

10

DB3

Data Bus 3

Parallel pin 5

11

DB4

Data Bus 4

Parallel pin 6

12

DB5

Data Bus 5

Parallel pin 7

13

DB6

Data Bus 6

Parallel pin 8

14

DB7

Data Bus 7

Parallel pin 9

15

A

LED backlight power +5V

Molex +5v (red wire)

16

K

LED backlight power ground

Molex ground (either black wire)